Find fx, 1',\" fx( 4,6), and f,_,( 5, 3) for the following equation. xxx) = ix? + y2 f: X _ (Type an exact answer, using radicals as needed.) fy= (Type an exact answer, using radicals as needed.) fx(-4,6)=D (Type an exact answer, using radicals as needed.) f,(5,3)=D (Type an exact answer, using radicals as needed.)